What the 1500 W rating means for the board
The 1.5KE36ARL4G: For a 30.8 V reverse standoff rail, the 49.9 V clamping ceiling means the protected circuitry sees no more than that voltage during the pulse, with a peak pulse current capacity of 30 A (cites:,).
Lifecycle reality — obsolete but sourced
Littelfuse lists the 1.5KE36ARL4G as obsolete — the manufacturer no longer produces it as a standard catalog item (cites:). Date-code consistency and marking integrity should be verified on receipt — the axial package is straightforward to authenticate by measuring the breakdown voltage (34.2 V min) and comparing the laser etch to known Littelfuse font standards for the Mosorb™ series (cites:,).